I did the cutting with a Dremel cutting wheel mounted on the drill press. Here are the steps.

1. Adjust the platform to the right hight so that the cutting line is at the wheel level.
2. To cut, just gently push the spinner to the spinning cutting wheel.

I found the plastic material on GP's spinner is pretty tough. It can easily break the abrasive cutting wheel if the spinner is pushed too hard against the wheel. So use caution.

I cut mine with this method in about 5 minutes.